Yes, it does make sense. Especially if you add in the clausterphobia established in "Never on Sunday."
I think the fact that it does make so much sense is probably the reason why it's become so commonly accepted. It's probably the most important quality of a successful bit of fanon. If it makes sense and it fits in with what we already know, if it seems like a natural extention of the character, then it probably will be picked up by others and added into the general understanding.
Paul
P.S. I hope I didn't go too far overboard with the pictures in my last post. I just got into finding images from different incarnations. It was there in the beginning. It was there in the movies. It was there after a nuclear explosion. It's still there now. It always has been and always will be there. It is... The Lock.